- Distribution and abundance of metabotropic glutamate receptor subtype 2 in rat brain revealed by [3H]LY354740 binding in vitro and quantitative radioautography: correlation with the sites of synthesis, expression, and agonist stimulation of [35S]GTPgammas binding. Richards, G., Messer, J., Malherbe, P., Pink, R., Brockhaus, M., Stadler, H., Wichmann, J., Schaffhauser, H., Mutel, V. J. Comp. Neurol. (2005)